Surveillance video released last week shows Pham's white Toyota Scion with a SCAD and OBX sticker on it, leaving the parking lot just 10 minutes before she was found dead in a heavily wooded ditch less than a mile from the shopping center on Arlington Blvd.

What's unclear is if Pham left alone from the nail salon she visited.

Detectives cannot account for the last ten minutes of Pham's life. They say the answers could lie in the busy shopping center where someone may have seen her or anything suspicious.

Detectives have translated the fliers into different languages including Korean and Vietnamese.

The aspiring fashion designer was a graduate at James Madison High School and was home for the summer after finishing her freshman year at a prestigious fashion college in Georgia.

Why anyone would want to kill the Falls Church teenager in her car is not only a question left for family and friends but mere strangers.

Connie O'Brien says, "It's such a tragedy."

After the fourth such area wide canvass, there are few clues leading to Pham's killer. Detectives are hoping Sunday's canvass will change that.